<template>
  <div v-if="!item.hidden">
    <template v-if="hasOneShowingChild(item.children, item)
        && (!onlyOneChild.children || onlyOneChild.noShowingChildren)
        && !item.alwaysShow">
      <app-link v-if="onlyOneChild.meta" :to="resolvePath(onlyOneChild.path, onlyOneChild.query)">
        <el-menu-item :index="resolvePath(onlyOneChild.path)" :class="{ 'submenu-title-noDropdown': !isNest }">
          <svg-icon :icon-class="onlyOneChild.meta.icon || (item.meta && item.meta.icon)" />
          <template #title>
            <span class="menu-title" :title="hasTitle(onlyOneChild.meta.title)">{{ onlyOneChild.meta.title }}</span>
          </template>
        </el-menu-item>
      </app-link>
    </template>

    <el-sub-menu v-else ref="subMenu" :index="resolvePath(item.path)" teleported>
      <template v-if="item.meta" #title>
        <svg-icon :icon-class="item.meta ? item.meta.icon : '' " />
        <span class="menu-title" :title="hasTitle(item.meta?.title)">{{ item.meta?.title }}</span>
      </template>

      <side-bar-item
          v-for="child in item.children"
          :key="child.path"
          :is-nest="true"
          :item="child as RouteRecordExtra"
          :base-path="resolvePath(child.path)"
          class="nest-menu"
      />
    </el-sub-menu>
  </div>
</template>

<script lang="ts">
export default {
  name: 'SideBarItem',
};
</script>

<script setup lang="ts">
import { isExternal } from '@/utils/validate'
import AppLink from './Link.vue'
import { normalizePath } from '@/utils/path'
import { RouteRecordExtra } from "vue-router";
import { PropType } from "vue";
import SvgIcon from "@/components/SvgIcon/index.vue";

const props = defineProps({
  // route object
  item: {
    type: Object as PropType<RouteRecordExtra>,
    required: true
  },
  isNest: {
    type: Boolean,
    default: false
  },
  basePath: {
    type: String,
    default: ''
  }
})

const onlyOneChild = ref<any>({});

const hasOneShowingChild = (children:RouteRecordExtra[] = [], parent: RouteRecordExtra) => {
  if (!children) {
    children = [];
  }
  const showingChildren = children.filter(item => {
    if (item.hidden) {
      return false
    } else {
      // Temp set(will be used if only has one showing child)
      onlyOneChild.value = item
      return true
    }
  })

  // When there is only one child router, the child router is displayed by default
  if (showingChildren.length === 1) {
    return true
  }

  // Show parent if there are no child router to display
  if (showingChildren.length === 0) {
    onlyOneChild.value = { ...parent, path: '', noShowingChildren: true }
    return true
  }

  return false
};

const resolvePath = (routePath:string, routeQuery?:string): any => {
  if (isExternal(routePath)) {
    return routePath
  }
  if (isExternal(props.basePath)) {
    return props.basePath
  }
  if (routeQuery) {
    let query = JSON.parse(routeQuery);
    return { path: normalizePath(props.basePath + '/' + routePath), query: query }
  }
  return normalizePath(props.basePath + '/' + routePath)
}

const hasTitle = (title: string | undefined): string => {
  if(!title || title.length <= 5) {
    return "";
  }
  return title;
}
</script>

<style lang="scss" scoped>
:deep(.el-menu-item) {
  svg {
    vertical-align: middle;
  }
}
</style>
